509997 has 8 divisors (see below), whose sum is σ = 694656. Its totient is φ = 332672.

The previous prime is 509989. The next prime is 510007. The reversal of 509997 is 799905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 509997 - 2³ = 509989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1668 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (86832).

2⁵⁰⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

509997 is a deficient number, since it is larger than the sum of its proper divisors (184659).

509997 is a wasteful number, since it uses less digits than its factorization.

509997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667.

The product of its (nonzero) digits is 25515, while the sum is 39.

The square root of 509997 is about 714.1407424311. The cubic root of 509997 is about 79.8955407460.

The spelling of 509997 in words is "five hundred nine thousand, nine hundred ninety-seven".